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.375 inch is 3/8 inch. On a standard tape marked in sixteenths, it sits at the sixth small mark after zero, halfway between the 1/4-inch and 1/2-inch lines. In metric terms, .375 inch equals 9.525 millimeters, or 0.9525 centimeters.
Why .375 equals 3/8 inch
.375 is a decimal fraction of an inch. Reduce 375/1000 by dividing the numerator and denominator by 125, and you get 3/8. Minnesota’s official table of decimal equivalents of common fractions in inches (Minnesota Office of the Revisor of Statutes, “4715.4100 — Decimal equivalents of common fractions in inches,” 2014 version) pairs 3/8 with .375 directly.
Finding .375 on a tape measure
Most tapes that show sixteenth-inch graduations let you locate .375 by counting. Because 3/8 equals 6/16, the mark is the sixth interval after the inch’s zero point.
- Hook the end of the tape on the edge of your material and pull it to the start of the measurement.
- Find the nearest whole inch below the target length, then move up to the 1/4-inch line. That line is 4/16.
- Count one more sixteenth past the 1/4-inch line. The 3/8-inch mark is the one you reach after two more sixteenths from 1/4 inch, which is 6/16.
- Confirm you are between the 1/4-inch and 1/2-inch lines, closer to the 1/4-inch mark than to the 1/2-inch mark only if your reading is just above 1/4; at exactly .375 it sits midway between them.
The count depends on the tape’s subdivision, so the same mark is located differently on different tapes:
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| Tape subdivision | Position of 3/8 inch (.375) | How to read it |
|---|---|---|
| Sixteenths | 6/16 | Sixth small interval after the inch’s zero point |
| Eighths | 3/8 | Third interval after zero |
| Thirty-seconds | 12/32 | Twelfth interval after zero |
Read the graduations on the tape you actually have. Subdivision and the look of the hash marks vary between tapes, so the count above assumes the common sixteenth-inch layout.
Converting .375 inch to metric
The National Institute of Standards and Technology (NIST), in its “Approximate Conversions from U.S. Customary Measures to Metric” table, gives 1 inch = 2.54 centimeters. Multiply:
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- 0.375 × 2.54 = 0.9525 centimeters
- 0.9525 centimeters × 10 = 9.525 millimeters
Keep the unit attached to the number. A bare .375 can mean another quantity, so write it as “.375 inch” or “3/8 inch” when you pass it on.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How accurate a tape’s marks are
A tape’s marks are calibrated, but the tape is not always exact. NIST’s page “How Do You Ensure That a Tape Measure Is Accurate?” (undated, accessed 2026) describes how tape hash marks are calibrated. It also states that, for buying and selling goods, a 1.82-meter (6-foot) tape should be accurate to within 0.79 millimeters (1/32 inch), according to NIST Handbook 44. That tolerance applies to that tape type in a commercial setting. It does not describe every tape, and it is not a guarantee for household or hobby tapes. For construction layout where a 1/32-inch error matters, check the tape against a known reference length before relying on it.
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This article reads the mark. It does not establish how precisely any specific tape is printed.
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Sources
- Minnesota Office of the Revisor of Statutes, “4715.4100 — Decimal equivalents of common fractions in inches” (2014 version).
- National Institute of Standards and Technology, “Approximate Conversions from U.S. Customary Measures to Metric.”
- National Institute of Standards and Technology, “How Do You Ensure That a Tape Measure Is Accurate?” (undated, accessed 2026).
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